Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2015, Vol. 31 ›› Issue (31): 274-279.doi: 10.11924/j.issn.1000-6850.casb15050069

Special Issue: 农业气象

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Analysis of Autumn Rains Features in Shaanxi in 2014

  

  • Received:2015-05-13 Revised:2015-06-15 Accepted:2015-06-25 Online:2015-11-16 Published:2015-11-16

Abstract: The paper aims to further study the formation mechanism of autumn rains in Shaanxi and provide references for forecast of autumn rains and decision making. Based on the daily precipitation data of automatic meteorological stations in Shaanxi and NCEP/NCAR reanalysis data, the authors analyzed the atmospheric general circulation and physical features of autumn rains from September 7 to 17 in 2014 in Shaanxi. The results indicated that the 500 hPa polar vortex and the western Pacific subtropical high were strong during autumn rains in Shaanxi Province. The continuous southwest warm moist air of peripheral subtropical high transmission provided ample moisture conditions and westbound typhoon was a favorable climate background. The analysis of physical characters showed that the persistent high humidity and water vapor convergence provided favorable conditions for autumn rains. Large negative value area of the vertical velocity had some significance for precipitation area and precipitation forecast.